Create a new Site using JQuery and Rest Services

(function( $ ) {
    $.fn.greenify = function( options ) {
// This is the easiest way to have default options.
var settings = $.extend({
// These are the defaults.
            color: "#556b2f",
            backgroundColor: "white"
        }, options );
// Greenify the collection based on the settings variable.
returnthis.css({
            color: settings.color,
            backgroundColor: settings.backgroundColor
        });
    };
}( jQuery ));
how to I call this function on a button clicK, please?